KISAP: Acquisition of In situ Acoustic Properties

Gil Young Kim1, Ki Ju Park2, Gwang-Soo Lee2 and Seong-Pil Kim2, (1)Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, South Korea, (2)Korea Institute of Geoscience and Mineral Resources (KIGAM), Gas Hydrate Department, Daejeon, Korea, Republic of (South)
Abstract:
The KISAP (KIGAM Seafloor Acoustic Probe) is an instrument developed to obtain in situ compressional wave velocity and attenuation profiles for upper several meters of sedimentary layer. This instrument consists of independent recording channels (NI cDAQ-9132, National Instruments) with a linear array of receivers (5 Hz-20 kHz) with depth below acoustic source (acoustic pinger, 1-50 kHz frequency). It provides in situ recording of full waveforms to determine interval velocity and attenuation. The system can be attached to a corer (gravity and/or piston corer) or to a specially designed probe. The experiment for in situ data acquisition was carried out in the Ulleung Basin, East Sea. We calculated in situ velocity from KISAP experiment. The velocities calculated for muddy sediments are from 1444 m/s to 1467 m/s. This result matches well with corrected laboratory data calculated considering in situ temperature and pressure. Therefore KISAP can be used to collect in situ acoustic data. In addition, it can be effectively used to calibrate previous laboratory data to in situ data.
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